Question: 7 x + 3 y + 2 z - 4 w = 1 8 4 w + 5 x - 3 y - 2 z

7x+3y+2z-4w=18
4w+5x-3y-2z=6
-2w-3x+y+z=-5
2z+3w+4y-8x=11

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